Erlangen 2018 – scientific programme
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MO: Fachverband Molekülphysik
MO 8: Ultrafast Spectroscopy with XUV (joint session MO/A)
MO 8.3: Talk
Monday, March 5, 2018, 17:00–17:15, PA 2.150
Electron-ion coincidence spectroscopy on small quantum systems — •Lena Worbs1, Andreas Przystawik1, David Schwickert1, Sergey Usenko1,2, and Tim Laarmann1,2 — 1Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, Hamburg 22607, Germany — 2The Hamburg Centre for Ultrafast Imaging CUI, Luruper Chaussee 149, Hamburg 22761, Germany
Relative phase control with sub-cycle precision of extreme-ultraviolet (XUV) pulses from a free-electron laser has been demonstrated by using a Michelson-type all reflective interferometric autocorrelator to trace the light-wave oscillation with a period of 129 as [1]. Novel applications using these phase controlled pulses in an electron-ion coincidence experiment will be discussed in the present contribution.
For this purpose a double-sided electron-ion coincidence spectrometer with delay-line detectors has been developed to detect electrons and ions generated in the same ionization event. The spectrometer detects ions and electrons with position-sensitivity providing angular-resolved information. The use of delay-line detectors enhances the information content of the electron spectra due to additional time-of-flight information on the ion side and thus the selection of wanted coincidence events, i.e. the selection of particularly charged ions as counterparts. First results on Xe atoms and C60 molecules will be discussed.
[1] Usenko, S. et al. Attosecond interferometry with self-amplified spontaneous emission of a free electron laser. Nat. Commun. 8, 15626 doi: 10.1038/ncomms15626 (2017)